Air compressor Manometer Pressure Gauge 1.Steel case,ABS case,SS case ... . Brass/SS connection 4.Glycerine fil Air compressor pressure gauge are used in Air Compressors,Hollow Pumps,Air-Pressure Piping,Pressure Regulating Valves,Testing ... - 15psi - 10,000psi (customer-made pressure range)4. Connection: Bottom (Vertical), Center Back (Horizontal), Lower Back,5. Connection Size: 1/8 ...